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Bluetooth: RFCOMM - Fix info leak in getsockopt(BT_SECURITY)

The RFCOMM code fails to initialize the key_size member of struct
bt_security before copying it to userland -- that for leaking one
byte kernel stack. Initialize key_size with 0 to avoid the info

Signed-off-by: Mathias Krause <>
Cc: Marcel Holtmann <>
Cc: Gustavo Padovan <>
Cc: Johan Hedberg <>
Signed-off-by: David S. Miller <>
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1 parent 3f68ba0 commit 9ad2de43f1aee7e7274a4e0d41465489299e344b @minipli minipli committed with davem330 Aug 15, 2012
Showing with 1 addition and 0 deletions.
  1. +1 −0 net/bluetooth/rfcomm/sock.c
1 net/bluetooth/rfcomm/sock.c
@@ -822,6 +822,7 @@ static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, c
sec.level = rfcomm_pi(sk)->sec_level;
+ sec.key_size = 0;
len = min_t(unsigned int, len, sizeof(sec));
if (copy_to_user(optval, (char *) &sec, len))

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